import Vue from 'vue'
import VueRouter from 'vue-router'
// import Login from '../components/Login.vue'
const Login = () => import('../components/Login.vue')
// import Home from '../components/Home.vue'
const Home = () => import('../components/Home.vue')
// 懒加载
// 当打包构建应用时，JavaScript 包会变得非常大，影响页面加载。
// 如果我们能把不同路由对应的组件分割成不同的代码块，
// 然后当路由被访问的时候才加载对应组件，这样就更加高效了。

const Welcome = () => import('../components/Welcome.vue')

const Users = () => import('../components/user/Users.vue')

const Rights = () => import('../components/power/Rights.vue')

const Roles = () => import('../components/power/Roles.vue')

const Cate = () => import('../components/goods/Cate.vue')

const Params = () => import('../components/goods/Params.vue')

const GoodsList = () => import('../components/goods/List.vue')

const Add = () => import('../components/goods/Add.vue')

const Order = () => import('../components/order/Order.vue')

const Report = () => import('../components/report/Report.vue')





//导入全局样式表
import '../assets/css/global.css'



Vue.use(VueRouter)

const routes = [
  {
    path: '/',
    redirect: '/login'
  },
  {
    path: '/login',
    component: Login
  },
  {
    path: '/home',
    component: Home,
    redirect: '/welcome',
    children: [
      {
        path: '/welcome',
        component: Welcome
      },
      {
        path: '/users',
        component: Users,
      },
      {
        path: '/rights',
        component: Rights
      },
      {
        path: '/roles',
        component: Roles
      },
      {
        path: '/categories',
        component: Cate,
      },
      {
        path: '/params',
        component: Params,
      },
      {
        path: '/goods',
        component: GoodsList,
      },
      {
        path: '/goods/add',
        component: Add,
      },
      {
        path: '/orders',
        component: Order,
      },
      {
        path: '/reports',
        component: Report,
      },
    ]
  },
]

const router = new VueRouter({
  routes
})

// 挂载路由导航守卫
router.beforeEach((to, from, next) => {
  // to 将要访问的路径
  // from 代表从哪个路径跳转而来
  // next 是一个函数，表示放行
  //    next()  放行   next('/login')  强制跳转

  if (to.path === '/login') {
    return next();
  }
  // 获取 token
  const tokenStr = window.sessionStorage.getItem('token');
  if (!tokenStr) {
    return next('/login');
  }
  next();
})

export default router
